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1// SPDX-License-Identifier: GPL-2.02/*3 * linux/fs/affs/symlink.c4 *5 * 1995 Hans-Joachim Widmaier - Modified for affs.6 *7 * Copyright (C) 1991, 1992 Linus Torvalds8 *9 * affs symlink handling code10 */11 12#include "affs.h"13 14static int affs_symlink_read_folio(struct file *file, struct folio *folio)15{16 struct buffer_head *bh;17 struct inode *inode = folio->mapping->host;18 char *link = folio_address(folio);19 struct slink_front *lf;20 int i, j;21 char c;22 char lc;23 24 pr_debug("get_link(ino=%lu)\n", inode->i_ino);25 26 bh = affs_bread(inode->i_sb, inode->i_ino);27 if (!bh)28 goto fail;29 i = 0;30 j = 0;31 lf = (struct slink_front *)bh->b_data;32 lc = 0;33 34 if (strchr(lf->symname,':')) { /* Handle assign or volume name */35 struct affs_sb_info *sbi = AFFS_SB(inode->i_sb);36 char *pf;37 spin_lock(&sbi->symlink_lock);38 pf = sbi->s_prefix ? sbi->s_prefix : "/";39 while (i < 1023 && (c = pf[i]))40 link[i++] = c;41 spin_unlock(&sbi->symlink_lock);42 while (i < 1023 && lf->symname[j] != ':')43 link[i++] = lf->symname[j++];44 if (i < 1023)45 link[i++] = '/';46 j++;47 lc = '/';48 }49 while (i < 1023 && (c = lf->symname[j])) {50 if (c == '/' && lc == '/' && i < 1020) { /* parent dir */51 link[i++] = '.';52 link[i++] = '.';53 }54 link[i++] = c;55 lc = c;56 j++;57 }58 link[i] = '\0';59 affs_brelse(bh);60 folio_mark_uptodate(folio);61 folio_unlock(folio);62 return 0;63fail:64 folio_unlock(folio);65 return -EIO;66}67 68const struct address_space_operations affs_symlink_aops = {69 .read_folio = affs_symlink_read_folio,70};71 72const struct inode_operations affs_symlink_inode_operations = {73 .get_link = page_get_link,74 .setattr = affs_notify_change,75};76